Public bug reported:
This report is related to a problem reported in IRC #ubuntu whereby
(Intel 8260 Wifi) Bluetooth device cannot load its firmware file at boot
time but can later.
Appears to be a race condition between the wifi chipset setting up the
device and enabling the attached USB interface to the Bluetooth device
fully.
Bluetooth: hci0: Failed to send firmware data (-38)
Bluetooth: hci0: Intel reset sent to retry FW download
The solution is to introduce a delay in loading the 'btusb' module:
echo "install btusb /usr/bin/sleep 2; /usr/sbin/modprobe --ignore-
install btusb" | sudo tee -a /etc/modprobe.d/btusb.conf
This imposes a 2 second delay before the 'btusb' module is loaded.
Reporting user tells us this works around the problem
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Attachment added: "Kernel Log"
https://bugs.launchpad.net/bugs/1940332/+attachment/5518599/+files/kernel.log
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1940332
Title:
hci0: Failed to send firmware data (-38)
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